This interactive game from PBS's NOVA Online allows students to observe a population of virtual creatures as they evolve under changing conditions. Background color, controlled by the student, represents environmental conditions, while the color of the organism indicates certain adaptations and mutations. Students are able to see how changes in environmental conditions support some colors of organisms, while others become extinct. The game includes instructions and an explanation of the game's purpose, but it is most useful when used in conjunction with supplementary evolution lessons.